The only limit to our realization of tomorrow is our doubts of today.

物理学的美丽在于它能够用简单的原理解释宇宙的复杂性。

I think track records are very important. If you start early trying to have a perfect one in some simple thing like honesty, you’re well on your way to success in this world.

Innovation requires courage, but even more persistence.

因此，自爱是行动的必要原则。